非阻塞分组交换网络的系统模型与性能分析

本文建立了具有输入与输出缓冲器非阻塞分组交换网络的排队模型,得出了平均排队长度、平均等待时间和饱和吞吐量的结果,指出可通过增加交换容量和降低先进先出的排队规则的限制来提高分组交换的吞吐量,最后提出了一种限制交换容量具有重复竞争机制的改进方案,对分组丢失概率进行了定量分析。从而确定了该结构的指标体系。     

Fit of Simple Analytic Functions to the Time Dependences of Nuclide Concentrations

Simple analytical functions are used to fit the results of theoretical numerical calculations of the time dependences of the specific mass of ²³⁵U, fission fragments, and the products of activition of fuel nuclei for VVÉR-440 and -1000 and RBMK-1000 reactors with an error of up to several percent. The possibilities of this formalism are examined for the example of the damaged RBMK-1000 reactor at Chernobyl.     

C~3I文电传输系统仿真技术研究

针对C~3I文电传输对通信网的特殊要求,文章重点对文电传输到达模式、服务过程、排队规则与系统排队建模等关键技术进行了研究,并对系统仿真程序工作流程提出了具体设计建议。文章可对C~3I通信网技术总体设计与方案论证提供参考。     

铝箔轧机辊系机构分析与研究

用能量稳定法对2200高速铝箔轧机现有辊系机构进行稳定性分析，得出现有辊系机构下辊系是不稳定的结论；用开／闭复合约束新概念，重新综合研究铝箔轧机辊系机构，即可解决该轧机工作辊轴承座与机架窗口间更换轧辊必留间隙和在运行时须消除间隙的矛盾，又可保证辊系处于稳定状态下运行。     

Comparison of immunohistochemistry, acid-fast staining, and cultivation for detection of Mycobacterium paratuberculosis in goats

Forty-seven paired specimens of ileum and mesenterial lymph nodes from goats originating from 2 herds with paratuberculosis were investigated. Culture of the specimens for Mycobacterium paratuberculosis was compared with Ziehl-Neelsen staining and with immunohistochemical tests on paraffin-embedded tissue sections, using a M. paratuberculosis immune serum and an avidin-biotin-alkaline phosphatase method. Immunohistochemical techniques detected most positive samples and produced more clearly visible reactions than did acid-fast staining. Eighteen of 47 samples were positive by immunohistochemical techniques may represent a valuable adjunct to standard techniques for diagnosis of paratuberculosis in goats.     

Use of ionizing radiation to prevent restenosis in interventional cardiology

It is well known that the expression of carbohydrate chains on cell changes during the development and progression of carcinoma. Some carbohydrate chains have been used in clinical practice as tumor markers. Some, such as sialyl Lewis a (CA 19.9), sialyl Lewis X, and Tn, are known to function as adhesion molecules. However, their role in the development of hematogenous metastasis is still controversial. In this paper, many investigations concerning this issue are reviewed. Clinical trials for treatment of patients with advanced cancer using carbohydrate chains are also mentioned.     

Retinylpalmitate-hydrolase activity of the intestine in experimental lambliasis]

The retinylpalmitate-hydrolase activity in the small intestine of healthy and lambliae infected rats was determined. Infection of rats with Giardia lambliae is shown to result in a fall of the retinylpalmiate-hydrase activity, which is restored, in part, on application of a specific therapy (0.1 g/kg of chinacrine) and then practically does not differ from that in healthy animals, when the specific therapy is employed in conjunction with an elevated dose of the vitamin "A" (2000 m. u. of retinyl-palmitate per day).